The unique properties of force, heat, light, electricity and magnetism of graphene make it have great application potential in the fields of microelectronics, biosensors, energy storage materials and composite materials.
The mechanical method performs graphene stripping, which has fewer defects than the graphene prepared by other chemical methods, and the structure is relatively complete. This paper will introduce the application of microfluidic high pressure homogenization method in the preparation of graphene.
Main instruments and raw materials:
Micro jet high pressure homogenizer
Sample of graphite raw materials sent by customers
Pre-test steps and results:
1) 2 parts to 2 sample bottles of the mixed raw material sample, 20 ml each;
2) Install F140Y-RT diamond interactive cavity, and connect micro-jet high-pressure homogenizer and real-time cooling system;
3) The control group was not treated, and the experimental group was homogenized 10 times at 20,000 psi;
4) Appearance observation of treated samples and control group
Figure 1 Before homogenization treatment (left), micro-jet high pressure homogenization treatment (right)
The sample after micro-fluid high-pressure homogenization treatment is like the state of Anmuxi yoghurt, the fluidity is low, the viscosity is large, and one drop of the sample of the firm cup is visible in the right beaker. After treatment, the volume of the sample becomes larger. Under the same reaction times, the larger the reaction pressure, the larger the volume expansion of the sample. In addition, the sample was observed obliquely, and the control group was highly fluid, and the experimental group was severely walled after tilting.
5) Observation of microscopic morphology of samples
Figure 2 Electron microscopy results returned by the customer (small layer of graphene)
Microjet high pressure homogenization principle:
1) The micro-jet high-pressure homogenizer consists of a power unit and a homogeneous core (diamond interaction chamber).
Figure 3 Microjet high pressure homogenizer (red circle: power unit, touch screen, blue circle: diamond interaction cavity)
2) The core of the high-pressure homogenization technology of the micro-jet in this experiment lies in the diamond interaction cavity of the micro-jet high-pressure homogenizer:
Figure 4 Temperature-controlled diamond interaction cavity physical (left), internal structure diagram (right)
Fig. 5 Schematic diagram of high pressure homogenization principle of microjet
The Y-shaped diamond interaction cavity has a fixed internal structure. After the graphite liquid is pressurized, a supersonic jet is formed through a hundred micron-sized channel, and severe shear, collision, cavity and pair are generated inside the Y-shaped diamond interaction cavity. Shooting effect. The application of the jet makes full use of the collision between the materials, which greatly reduces the wear of the material to the cavity of the interaction cavity. The high-pressure homogenization technology of the micro-jet combines the advantages of micro-jet, impinging flow and traditional high-pressure homogenization technology. Has a higher homogeneity efficiency.
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